TurboTax doesn't seem to be calculating long term capital gains correctly. It tells me that everything is being taxed at 20%.

A capital gains rate of 20% applies if taxable income exceeds the thresholds showing below:

•  $518,900 for single;
•  $291,850 for married filing separately;
•  $583,750 for married filing jointly and qualifying surviving spouse; and
•  $551,350 for head of household.

irs.gov

Shouldn't the program be taxing 15% for everything under $518,900, and 20% for everything over? Thanks!